Hello,

I'm french, so sorry for my bad english...

I'm an Android developer and, in my app, i recently add hellocharts to replace another old chart library. It's a very beautiful lib, and i congratulate developers :-)

But I've a problem since i imported this solution in my fragments of an activity...

Now i often have Out Of Memory Errors that make my app crash. When i see the error log I see each time :

" java.lang.OutOfMemoryError at android.graphics.Bitmap.nativeCreate(Native Method) ... at lecho.lib.hellocharts.renderer.LineChartRenderer.initDataMeasuremetns(LineChartRenderer.java:93)"

and i don't know what to do in my onStop() or onDestroy() functions to make it disappear... I tried to use chart.destroyDrawingCache() function but it seems to be useless.... Could you help me please?

Thank you very much!

Regards.

thanks for the help. the viewport thing help me to show more of the graph.

But my 1st problem was that i was not able to see the value of the graph

//values of the axeY
List<AxisValue> axisValuesForY = new ArrayList<AxisValue>();

for (int i = 1; i < 100; i +=10){
    axisValuesForX.add(new AxisValue(i));
}

Axis axeX = new Axis(axisValuesForX);
Axis axeY = new Axis(axisValuesForY);

data.setAxisXBottom(axeX);
data.setAxisYLeft(axeY);

i've done this and nothing show's up on the axeY neither for X. Plus i've put this.

axeX.setName("Days");
axeY.setName("amount");

and only day is displayed

goodmorning,

i'm using your library but i have some problem with multiple lines.

1. it's possible to create two different lines using differents axis without using scale and range?

2. i use that code:

ArrayList axisValues = new ArrayList(); for (float i = 0; i < maxTime; i += 1000) { axisValues.add(new AxisValue(i, moreWorkouts .formatMinutes((long) i))); } Axis tempoAxis = new Axis(axisValues) .setMaxLabelChars(5) .setTextColor(Color.RED) .setHasSeparationLine(false) .setFormatter( new HeightValueFormater(scale, sub, 1, null, null));

where formatMinutes create char in format hh:mm. By this the formatter look not work and the value of axis result not scaled.

3. it's possible to have dinamically decimal number using setFormatter for axis right, like axis without setFormatter.

sorry for my english. thanks a lot. nicholas

The looked in to the sample app and couldn't find a self-explanatory usage of the classes AxisValueFormatter() and SimpleLineChartValueFormatter(). Would be great if you could give some explanation of these classes, their methods and how to use them.

I'm seeking to format my chart's axis values extensively... so in dire need of this. Thanks!

I don't know if this already exists, or if this should be part of the charts, but I thought I'd suggest these anyway in case it makes sense:

• The ability to set a title that appears somewhere in the LineChart area. Something like chart.setTitle
• The ability to show a legend (eg when using multiple line) indicating what the different line colors mean. I suppose this could be derived from something like Line.setName.

Anyway, thanks for all the work on this chart, it's very nice and easy to use. The structure of the charts has been well thought out.

I thought of creating an option for the label is printed in 45º, or the user's choice. As you can see in the picture, the data may be confusing in some cases. What do you think?

Before

After

Something like this:

AxesRenderer.java

    private void drawAxisHorizontalLabels(Canvas canvas, Axis axis, int position) {
        final Rect contentRectMargins = chart.getChartComputator().getContentRectWithMargins();


        for (int valueToDrawIndex = 0; valueToDrawIndex < axisValuesToDrawNumTab[position]; ++valueToDrawIndex) {
            int charsNumber = 0;

            if (axis.isAutoGenerated()) {
                final float value = axisAutoValuesToDrawTab[position][valueToDrawIndex];
                charsNumber = axis.getFormatter().formatValueForAutoGeneratedAxis(labelBuffer, value,
                        axisAutoValuesBufferTab[position].decimals);
            } else {
                AxisValue axisValue = axisValuesToDrawTab[position][valueToDrawIndex];
                charsNumber = axis.getFormatter().formatValueForManualAxis(labelBuffer, axisValue);
            }

            canvas.save(); // here
            canvas.rotate(degrees ,axisRawValuesTab[position][valueToDrawIndex], axisFixedCoordinateTab[position]); // here
            canvas.drawText(labelBuffer, labelBuffer.length - charsNumber, charsNumber,
                    axisRawValuesTab[position][valueToDrawIndex], axisFixedCoordinateTab[position],
                    textPaintTab[position]);
            canvas.restore(); // here
        }


        // Drawing axis name
        if (!TextUtils.isEmpty(axis.getName())) {
            textPaintTab[position].setTextAlign(Align.CENTER);
            canvas.drawText(axis.getName(), contentRectMargins.centerX(), axisNameBaselineTab[position],
                    textPaintTab[position]);
        }
    }

I want to show a set of dates in the X Axis that can adjust the visible range (show/hide) based on zoom level (like the integers when setAutoGenerated(true) is set). How can I do it?

I wanna show this effect： but in my codes , the effect like this： is there some thing wrong ? how can I get that . and can I make the "日期" from center to the left position .

Hello Guys!

My Input values are from 0 to 6 and the Lines the YAxis are displaying are 0, 0.3, 0.6, 0.9 .... 5.1, 5.4, 5.7. just like in the picture below:

Is there are way to limit it to 5 lines + offset like in the picture below? assuming that the data is 0 to 6

Additonal question: Can I make the style of the line dashed?

Hi, I get java.lang.ArithmeticException: divide by zero in lecho.lib.hellocharts.renderer.AxesRenderer.prepareCustomAxis This exception occurs when I have only one value for LineChartData. My point data looks like this: PointValue [x=1.4261441E12, y=64.0] where 'x' is timestamp. I want to show day of week on x axis, so I add also a list of AxisValue where AxisValue [label=[T,h,u], value=1.426144100352E12] Then:

lineChartData = new LineChartData(); Axis axis = new Axis(axisLabels).setHasLines(true); axis.setMaxLabelChars(100); lineChartData.setAxisXBottom(axis); //! THIS LINE CAUSE AN EXCEPTION lineChartData.setAxisYLeft(new Axis().setHasLines(true)); lineChartData.setLines(graphLines);

Removing lineChartData.setAxisXBottom(axis); line resolve the problem, but custom x axis label don't work in this case

I have alot of trouble with using this library as an offline external lib. Whatever I try to do in Android Studio everything fails. Is it possible to import it is a jar and add it as a library in Android Studio?

I couldn't configured library in my project. I had done in my way what I have to do and also followed your instructions in your readme file. Please help me. Thanks

I'm getting this error when I sync after adding the dependency.

7:07 PM Unsupported Modules Detected: Compilation is not supported for following modules: App Name. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project.

My x-axis is displayed normally, but the y-axis is not displayed. How can I solve this? Where is the root of the problem?? This is my email: [email protected] && [email protected] I am very grateful to you for solving this problem for me Here is my code ↓:

` List axisX = new ArrayList<>(); for(int index = 0; index < GPST.size(); index++) axisX.add(new AxisValue(index).setLabel(GPST.get(index)));

                    List<AxisValue> axisY = new ArrayList<>();
                    for(int index = 0; index < Dist.size(); index++) {
                        axisY.add(new AxisValue(index).setLabel(Dist.get(index)));
                    }

                    // This is Y axis
                    Axis axis1 = new Axis();
                    axis1.setValues(axisX);
                    axis1.setTextColor(Color.BLUE);

                    // This is Y axis
                    Axis axis2 = new Axis();
                    axis2.setValues(axisY);

                    data.setAxisXBottom(axis2);
                    data.setAxisYLeft(axis1);
                    lineChartView.setLineChartData(data);

`

关于一个点不显示问题，网上找了很多方案，大致都是说要去改源码的，但我觉得比较麻烦，说下我的解决方法： 我是判断如果我的列表只有一个值的话，就动态给添加一个空数据元素（value为负数），这样相当于是两个点，而第二个点的值是负数，那就会把第二个点绘制到x轴的下面，这样就看不到了，也就是默认显示了一个点带一根线，然后动态判断把这个线设置成白色即可

；下面是截图：

I have a line chart filled with 432 points. The graph looks very cluttered and I was wondering if it is possible to set a horizontal distance between each point. As you can see above the points are very close together (and for some reason the y axis has multiple points for the same number)